Hi Kaley
Your alcoholism analogy doesn't sound right to me. CD may be addicting but is not really harmful, except to some people's perceptions. When you say inherently/morally wrong, can you elaborate? Was that from a religious perspective? Some people's religious views are very rigid. Is it a deal breaker for her because of that?
This is part of you that is not going away. Maybe if you communicate that finality and the importance to you of being true to yourself (and no longer lying to her), she'll mellow in her views. If she is still holding on to the hope that you can "beat" this, she may not want to accept it.
Getting to DADT would be a win, but I would try to propose dressing in your own home, and use your mom's house as a fallback.
Best of luck to you
Shibumi